cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-4 of 4 results.

A213425 Irregular array T(n,k) of numbers/2 of non-extendable (complete) non-self-adjacent simple paths of each length within a square lattice bounded by rectangles with nodal dimensions n and 8, n >= 2.

Original entry on oeis.org

4, 4, 6, 10, 14, 20, 30, 40, 34, 10, 4, 8, 16, 22, 52, 68, 144, 222, 334, 406, 302, 288, 198, 88, 52, 6, 4, 8, 20, 40, 82, 124, 258, 400, 894, 1098, 1984, 1960, 2796, 2388, 3426, 2290, 2638, 1008, 1316, 152
Offset: 2

Views

Author

Christopher Hunt Gribble, Jun 11 2012

Keywords

Comments

The irregular array of numbers is:
...k..3....4....5....6....7....8....9...10...11...12...13...14...15...16...17...18...19...20...21...22
.n
.2....4....4....6...10...14...20...30...40...34...10
.3....4....8...16...22...52...68..144..222..334..406..302..288..198...88...52....6
.4....4....8...20...40...82..124..258..400..894.1098.1984.1960.2796.2388.3426.2290.2638.1008.1316..152
where k is the path length in nodes. There is insufficient evidence to attempt to define the irregularity of the array. However, the maximum values of k for 2 <= n <= 10 are 12, 18, 22, 27, 32, 38, 42, 48, 52. Reading this array by rows gives the sequence. One half of the numbers of paths constitute the sequence to remove the effect of the bilateral symmetry of the rectangle.

Examples

			T(2,3) = One half of the number of complete non-self-adjacent simple paths of length 3 nodes within a square lattice bounded by a 2 X 8 node rectangle.

Links

Crossrefs

Cf. A213106, A213249, A213274, A213089, A213342, A213375, A213379, A213383.

A213426 Irregular array T(n,k) of numbers/2 of non-extendable (complete) non-self-adjacent simple paths of each length within a square lattice bounded by rectangles with nodal dimensions n and 9, n >= 2.

Original entry on oeis.org

4, 4, 6, 10, 14, 20, 30, 44, 60, 60, 28, 2, 4, 8, 16, 22, 54, 70, 152, 238, 416, 574, 810, 642, 760, 456, 320, 136, 72, 8, 4, 8, 20, 40, 84, 126, 268, 418, 1014, 1450, 2890, 3510, 5474, 5286, 7238, 6926, 8218, 5636, 6754, 2956, 4220, 778, 48
Offset: 2

Views

Author

Christopher Hunt Gribble, Jun 11 2012

Keywords

Comments

The irregular array of numbers is:
...k..3....4....5....6....7....8....9...10...11...12...13...14...15...16...17...18...19...20...21...22...23...24...25
.n
.2....4....4....6...10...14...20...30...44...60...60...28....2
.3....4....8...16...22...54...70..152..238..416..574..810..642..760..456..320..136...72....8
.4....4....8...20...40...84..126..268..418.1014.1450.2890.3510.5474.5286.7238.6926.8218.5636.6754.2956.4220..778...48
where k is the path length in nodes. There is insufficient evidence to attempt to define the irregularity of the array. However, the maximum values of k for 2 <= n <= 10 are 14, 20, 25, 30, 36, 42, 48, 53. Reading this array by rows gives the sequence. One half of the numbers of paths constitute the sequence to remove the effect of the bilateral symmetry of the rectangle.

Examples

			T(2,3) = One half of the number of complete non-self-adjacent simple paths of length 3 nodes within a square lattice bounded by a 2 X 9 node rectangle.

Links

Crossrefs

Cf. A213106, A213249, A213274, A213089, A213342, A213375, A213379, A213383, A213425.

A214373 Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths ending at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 7, n >= 2.

Original entry on oeis.org

52, 0, 0, 0, 353, 57, 62, 60, 10, 0, 0, 0, 1931, 495, 622, 602, 200, 56, 262, 364, 12027, 3522, 4399, 4170, 2143, 640, 1941, 2394, 2612, 954, 3956, 5136, 76933, 21068, 26181, 25090, 17601, 3675, 9258, 10048, 20009, 7213, 26414, 32132
Offset: 2

Views

Author

Christopher Hunt Gribble, Jul 14 2012

Keywords

Comments

The subset of nodes is contained in the top left-hand quarter of the rectangle and has nodal dimensions floor((n+1)/2) and 4 to capture all geometrically distinct counts.
The quarter-rectangle is read by rows.
The irregular array of numbers is:
...k.....1.....2.....3.....4.....5.....6.....7.....8.....9....10....11....12
.n
.2......52.....0.....0.....0
.3.....353....57....62....60....10.....0.....0.....0
.4....1931...495...622...602...200....56...262...364
.5...12027..3522..4399..4170..2143...640..1941..2394..2612...954..3956..5136
.6...76933.21068.26181.25090.17601..3675..9258.10048.20009..7213.26414.32132
where k indicates the position of the end node in the quarter-rectangle.
For each n, the maximum value of k is 4*floor((n+1)/2).
Reading this array by rows gives the sequence.

Examples

			When n = 2, the number of times (NT) each node in the rectangle is the end node (EN) of a complete non-self-adjacent simple path is
EN  0  1  2  3  4  5  6
    7  8  9 10 11 12 13
NT 52  0  0  0  0  0 52
   52  0  0  0  0  0 52
To limit duplication, only the top left-hand corner 52 and the three zeros to its right are stored in the sequence, i.e. T(2,1) = 31, T(2,2) = 0, T(2,3) = 0 and T(2,4) = 0.

Links

Crossrefs

Cf. A213106, A213249, A213383, A214037, A214119, A214121, A214122, A214359, A213070.

Extensions

Comment corrected by Christopher Hunt Gribble, Jul 22 2012

A214503 Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths incorporating each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 7, n >= 2.

Original entry on oeis.org

113, 116, 116, 122, 906, 1028, 1050, 1088, 1016, 1152, 1020, 980, 6751, 8562, 9411, 9718, 8651, 8317, 7116, 6882, 50036, 69029, 80263, 82942, 71736, 67670, 61229, 60116, 81276, 63148, 46550, 44196, 335569, 482769, 577787, 600124, 494659, 488710, 465142, 458850, 599448, 463257, 353704, 341918
Offset: 2

Views

Author

Christopher Hunt Gribble, Jul 22 2012

Keywords

Comments

The subset of nodes is contained in the top left-hand quarter of the rectangle and has nodal dimensions floor((n+1)/2) and 4 to capture all geometrically distinct counts.
The quarter-rectangle is read by rows.
The irregular array of numbers is:
...k......1......2......3......4......5......6......7......8......9.....10.....11.....12
.n
.2......113....116....116....122
.3......906...1028...1050...1088...1016...1152...1020....980
.4.....6751...8562...9411...9718...8651...8317...7116...6882
.5....50036..69029..80263..82942..71736..67670..61229..60116..81276..63148..46550..44196
.6...335569.482769.577787.600124.494659.488710.465142.458850.599448.463257.353704.341918
where k indicates the position of a node in the quarter-rectangle.
For each n, the maximum value of k is 4*floor((n+1)/2).
Reading this array by rows gives the sequence.

Examples

			When n = 2, the number of times (NT) each node in the rectangle (N) occurs in a complete non-self-adjacent simple path is
N    0   1   2   3   4   5   6
     7   8   9  10  11  12  13
NT 113 116 116 122 116 116 113
   113 116 116 122 116 116 113
To limit duplication, only the top left-hand corner 113 and the 116, 116, 122 to its right are stored in the sequence,
i.e. T(2,1) = 113, T(2,2) = 116, T(2,3) = 116 and T(2,4) = 122.

Links

Crossrefs

Cf. A213106, A213249, A213383, A214037, A214373, A214397, A214399, A214504, A214510, A214563, A214601
Showing 1-4 of 4 results.

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